refactor(sound): replace DTO with id in delete request

[theEvilReaper]

Proposed changes

The pull request changes the parameter usage in the DELETE request of the "{id}/sources/delete endpoint in the SoundController. With the current implementation there is the problem that it requires the complete SoundFileSourceDTO to get the id from it. This is a bit stupid and requires more data which must be send over the network.

So this pull request changes the required parameter to the id from the model which is must better for the network and reduces complexity.

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

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• I have read the CONTRIBUTING.md
• I have added tests that prove my fix is effective or that my feature works
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[TheMeinerLP]

Instead of sending it as a Body, we should consider as a path variable.